Copyright 2000 Carrier Corporation Form 50AH-5PD

Single Package Cooling UnitsFeaturing:• compact design• flexibility• easy maintenance• high quality and reliability• quiet and efficient scroll compressor

technology

Features/BenefitsAll in one package — high cooling efficiency, installation convenience, ease of accessibility for time-saving maintenance.Space and cost saving designModel 50AH is specifically designed to provide the building owner with truly out-of-sight cooling, because it installs inside the ceiling. That’s why we call it the Car-rier ROOMTOP® unit. The compact de-sign and low silhouette enable it to fit easily and securely above the conditioned space. Single package construction makes it easy to install with minimal time and cost.

Application flexibilityIf desired for particular applications, the unit can also be installed as a split system with the condenser section mounted hor-izontally. Centrifugal fans permit ducting of both evaporator and condenser air.

Quiet operationCommercial end users appreciate the ex-tra comfort of quiet operation. Carrier engineers met the challenge by specify-ing heavy insulation, vibration-resistant construction and operating components that function at low noise levels, all of which keep system sound at a minimum level.

Easy maintenanceWhen it comes to maintenance, the 50AH rates high in accessibility. Indoor

50AHHorizontal Indoor

Single-PackageCooling Units

2 to 5 Nominal Tons

ProductData

2

location is ideal for the maintenance technician, and five access panels, easily removed, provide quick and convenient access to all components when needed. As an added plus, all required service/maintenance access can be from one side allowing the unit to be located against a wall or ceiling plenum obstruc-tion, an obvious space-saving idea.

Carrier quality and reliabilityThe Carrier 50AH ROOMTOP® units have much to offer the cost- andefficiency-conscious commercial owner. Every unit is thoroughly run tested at the factory and equipped with safety controls designed to monitor and protect over the life of the unit.

Scroll compressor technologyScroll compressors are designed for high efficiency and are internally spring mounted to minimize vibration noise. Each compressor is hermetically sealed against contamination to promote longer life and dependable operation. Scroll compressors are standard on all units.

Table of contentsPage

Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1,2Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2ARI Capacity Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Field-Installed Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-8Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9,10Typical Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11,12Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14,15

Model number nomenclature

ARI* capacity ratings

LEGEND

*Air-conditioning and Refrigeration Institute.

NOTES:1. Ratings are at zero condenser air static and rated in

accordance with ARI Standard 210.

UNIT50AH V-PH-Hz TOTAL

kWNET TOTAL

COOLING CAP. (Btuh)NOMINAL

CFM EER SEER SEER(with TDR)

SOUND RATING(dB)

024 208/230-1-60 2.6 25,000 800 — 10.80 11.00 78

036208/230-1-60

4.3 36,000 1200— 10.00 10.05

82208/230-3-60 9.0 — —460-3-60 9.0 — —

048

208/230-1-60

5.5 49,500 1600

— 10.20 10.40

82208/230-3-60 9.1 — —460-3-60 9.1 — —575-3-60 9.1 — —

060

208/230-1-60

6.9 58,500 2000

— 9.75 10.05

82208/230-3-60 8.55 — —460-3-60 8.55 — —575-3-60 8.55 — —

dB — DecibelsEER — Energy Efficiency RatioSEER — Seasonal Energy Efficiency RatioTDR — Time-Delay Relay 2. EER =

NET CAPACITY (Btuh)TOTAL WATTS

Indoor Fan Motor– – Standard MotorM – 1.5 hp Optional Motor

FIOP*

50AH – 048 – M – 5 4 1 XX

Model Designation –50AH Horizontal,Indoor Single-PackageCooling Unit

Packaging1 – Domestic2 – Export

Design Revision

Voltage1 – 575-3-603 – 208/230-1-60

5 – 208/230-3-606 – 460-3-60

Nominal Tons024 – 2036 – 3

048 – 4060 – 5

*FIOP — Factory-Installed option, contact your Carrier representative for details.

3

LEGEND

*Shipping weights include base unit plus packaging.†If components are to be split, additional refrigerant will be needed.**Use Type L copper only.

NOTE: If components are to be split, the maximum length of refrigerant tubing to beused is 50 equivalent ft, assuming components will be installed in same horizontal plane.If components are not to be installed in same horizontal plane, contact your Carrier rep-resentative for more information. For additional piping information, refer to Carrier Sys-tem Design Manual, Part 3.

UNIT 50AH 024 036 048 060SHIPPING WEIGHT (lb)* 560 590 690 700OPERATING WEIGHT (lb)

Base Unit 450 480 580 590REFRIGERANT TYPE R-22

Operating Charge (lb)† 5.4 5.5 8.0 7.6COMPRESSOR — TYPE Scroll

Quantity...Model (1)...ZR23 (1)...ZR34 (1)...ZR49 (1)...ZR57Oil (oz) 24 42 48 54HPS Setting (psig)

Cutout 426 ± 7Reset 320 ± 20

LPS Setting (psig)Cutout 27 ± 4Reset 67 ± 7

CONDENSATE DRAIN CONNECTIONSize (in.)...Type 3/4...FPT

CONDENSER FAN Centrifugal — Direct Drive Centrifugal — Belt DriveNominal Cfm 1350 1350 2250 2450Maximum Rpm 1100 1500Blower Size (in.) 12 x 6 12 x 9Pulley Pitch Diameter (in.)

Blower None 5.0 6.0 6.0Motor (Variable) None 2.4-3.4 1.9-2.9 2.4-3.4

Motor Hp 1/2 3/4 1 11/2Motor Rpm 825 1725 1725 1725

EVAPORATOR AIR FAN (Standard) Centrifugal — Direct DriveNominal Cfm 800 1200 1600 2000Max Rpm 1100 1150 1050Blower Size (in.) 10 x 5 10 x 6 10 x 6Motor Hp (Rpm) 1/3 (850) 1/2 (1075) 3/4 (1050)

EVAPORATOR AIR FAN (Optional)

NotAvailable

Centrifugal Belt DriveNominal Cfm 1600 2000Max Rpm 1300Blower Size (in.) 10 x 8Motor Hp 11/2Motor Rpm 1725Pulley Pitch Diameter (in.)

Blower 4.2Motor (Variable) 2.4-3.4

CONDENSER COIL Copper Tubes — Aluminum FinsSize (L x H) (in.) 40 x 15 40 x 16 40 x 22Number of Rows...Fins/in. 4...13.6 4...17 4...13.6

EVAPORATOR COIL Copper Tubes — Aluminum FinsSize (L x H) (in.) 34 x 15 34 x 16 34 x 22Number of Rows...Fins/in. 4...14.4 4...15 4...14.4

INDOOR-AIR FILTERS Factory-Supplied Cleanable TypeNumber...Size (in.) 1...14 x 34 x 1 1...21 x 34 x 1

INTERCONNECTING TUBING SIZE (in.)**Hot Gas 1/2 1/2 1/2 1/2Liquid 3/8 3/8 3/8 3/8

HPS — High-Pressure SwitchLPS — Low-Pressure Switch

Physical data

NOTE: Fasten threaded rods through holes in end frames. Use 2 rodson each side of unit for a total of 4.

OPERATING WEIGHT DISTRIBUTION ANDCENTER OF GRAVITY

All panels must be in place when rigging.

UNIT50AH

WEIGHT (lb/kg)OF CORNER

DIMENSIONS(ft-in./mm)

1 2 3 4 A B024 93/42 108/49 139/63 120/54 2-5 /737 2-15/8/651036 95/43 113/51 148/67 124/56 2-43/4/730 2-2 /660048 112/51 143/65 183/83 142/64 2-5 /737 2-3 /686060 114/52 143/65 186/84 147/67 2-43/4/730 2-23/4/679

4

Thermostat and subbase — Attractive wall-mounted24-v accessory provides precise temperature control.Automatic and Manual changeover models available. Athermostat subbase is available that works with Cycle-LOC™ circuitry. If a safety device trips, compressor locksout and subbase warning light (LK OUT) alerts occupant.

Three models available: One stage cool/two stage heat;two stage cool/two stage heat; one stage cool/one stageheat.Time Guard® II circuit (standard on single-phaseunits) — Time Guard II device prevents short cycling ofcompressor if thermostat is rapidly changed; automaticallyprevents compressor from restarting for 5 minutes aftershutdown.Electric heaters — A wide range of models availablefrom 5 to 30 kW, 208-, 240- and 480-v, single- and 3-phunits. Mount easily on 50AH discharge opening. Heatercontrol box accessible from the bottom of heater.

Condensate pump — The condensate pump is usedwhen the distance and slope to the nearest drain is farenough to prevent the natural drainage of unit. The pumpis mounted remotely from the unit and includes a signallight (field-installed) which illuminates when the reservoirrises beyond a certain level. The unit automatically shutsdown when this reservoir level is achieved.Head pressure control damper — This accessory isduct mounted and allows unit to mechanically cool down to0° F.

Damper dimensions fit 024, 036 sizes.NOTE: For use with 048 and 060 size units, ductworkfrom unit to damper must be reduced in size to fit damperdimensions.Vibration isolators — Package of four isolators used fordampening any unit vibration so that vibrating sounds arenot transmitted to building structure. Isolators are spring,ceiling type.

Field-installed accessories

88EN ELECTRIC HEAT MODULEACCESSORY

DIMENSIONS (in.)

UNIT50AH A B C D DUCT

OPENING

024,036 131/2 16 21/2 81/2 71/8 x 14

048,060 24 213/4 3 19 71/8 x 207/8

HEAD PRESSURE CONTROL DAMPER (in.)

5

Base unit dimensions

DIMENSIONS (ft-in.)

UNIT50AH A B C D E

024 2-5 2-15/8 1- 53/4 1-2 1-1036 2-43/4 2-2 1- 53/4 1-2 1-1048 2-5 2-3 1-115/8 1-87/8 1-77/8060 2-43/4 2-23/4 1-115/8 1-87/8 1-77/8

UNIT COMPONENT LOCATIONS

6

I. Determine cooling requirements at designconditions.Given:Gross Cooling CapacityRequired (TC) . . . . . . . . . . . . . . . . . .39,000 BtuhSensible Heat Capacity (SHC) . . . . . .30,500 BtuhTemperature of Air Entering Condenser . . . . .95 FTemperature of Air EnteringEvaporator . . . . . . . . . . . . . . . 80 F edb/67 F ewbEvaporator Air Quantity. . . . . . . . . . . . 1,200 cfmExternal Static Pressure:

Condenser . . . . . . . . . . . . . . . . . . .0.50 in. wgEvaporator (includes static pressure

drop of factory-supplied filterof 0.06 in. wg) . . . . . . . . . . . . . . .0.20 in. wg

II. Select unit based upon required coolingcapacity.Enter cooling capacity table at temperature of airentering condenser of 95 F. The 50AH036 unit at

1200 cfm and 67 F ewb will provide a TotalCapacity (TC) of 44,200 Btuh and a Sensible HeatCapacity (SHC) of 31,300 Btuh. Since the enteringair is 80 F edb, an SHC correction is not required.

III. III Determine evaporator fan performance.Enter Evaporator Fan Performance table at1200 cfm and 50AH036 data. The external staticpressure shown (0.23 in. wg) will exceed the0.20 in. wg required. The fan motor will require0.52 kW.

IV. IV Determine condenser fan performanceand motor pulley setting requirements.Enter Condenser Fan Performance table atthe selected cfm and required static pressure of0.50 in. wg. The fan motor will require 0.73 kWand the motor pulley should be set at 2 turns openat 1350 cfm of condenser air required.NOTE: Unit 50AH024 contains a direct-drive con-denser fan assembly.

Performance dataGROSS COOLING CAPACITIES

See Legend on page 7.

50AH024

TempAir Ent

Condenser(F)

Evaporator Air Quantity — Cfm/BF600/0.02 800/0.03 1000/0.04

Evaporator Air Ewb Temp (F)72 67 62 72 67 62 72 67 62

85TC 27.1 25.3 23.0 27.7 26.4 24.6 27.8 26.9 25.8SHC 13.5 17.0 20.2 14.7 19.4 23.7 15.6 21.5 25.8kW 1.64 1.62 1.61 1.65 1.63 1.62 1.65 1.64 1.63

95TC 26.6 24.5 20.8 27.4 25.8 22.9 28.0 26.5 25.2SHC 13.4 16.7 19.1 14.7 19.4 22.8 16.0 21.7 25.2kW 1.85 1.84 1.80 1.86 1.85 1.82 1.87 1.85 1.84

105TC 25.8 22.3 18.4 27.1 24.5 21.2 27.7 25.6 23.6SHC 13.1 15.8 17.9 14.7 18.9 21.2 16.2 21.5 23.6kW 2.09 2.05 1.99 2.11 2.08 2.04 2.12 2.10 2.07

115TC 24.6 19.9 16.5 26.1 22.0 19.8 26.8 23.6 22.3SHC 12.7 14.8 16.5 14.4 17.9 19.8 16.0 20.7 22.3kW 2.36 2.29 2.22 2.39 2.33 2.29 2.39 2.35 2.33

50AH036

TempAir Ent

Condenser(F)

Evaporator Air Quantity — Cfm/BF900/0.01 1050/0.01 1200/0.02

Evaporator Air Ewb Temp (F)72 67 62 72 67 62 72 67 62

85TC 45.0 41.1 37.3 45.8 42.3 38.6 46.5 43.4 39.8SHC 22.5 27.7 32.6 23.6 29.9 35.6 24.6 32.0 38.3kW 3.19 3.07 2.96 3.22 3.11 3.00 3.25 3.14 3.04

95TC 43.0 38.8 34.3 44.1 40.1 35.8 45.0 44.2 37.4SHC 21.8 26.8 31.1 23.1 29.1 34.1 24.4 31.3 36.8kW 3.42 3.28 3.15 3.46 3.33 3.20 3.49 3.37 3.25

105TC 40.4 35.8 29.6 41.6 37.1 31.3 42.6 38.2 33.2SHC 20.9 25.6 28.5 22.3 27.9 30.8 23.7 30.2 33.2kW 3.63 3.48 3.38 3.68 3.53 3.44 3.73 3.58 3.49

115TC 37.7 30.6 25.8 38.7 31.6 37.8 39.7 32.8 29.7SHC 19.9 23.3 25.8 21.3 25.5 27.8 22.7 27.8 29.7kW 3.85 3.71 3.59 3.90 3.76 3.67 3.94 3.80 3.73

Selection procedure (with example)

7

GROSS COOLING CAPACITIES (cont)

LEGEND

NOTES:1. Performance based on nominal condenser airflow listed in physical data table

on page 3.2. SHC is based on 80 F db temperature of air entering the coil.

Below 80 F db, subtract (corr factor x cfm) from SHC.Above 80 F db, add (corr factor x cfm) to SHC.

Correction Factor = 1.10 x (1 – BF) x db – 80)

The following formulas may be used:

Where:hewb = Enthalpy of air entering evaporator coil

EVAPORATOR FAN PERFORMANCE

LEGEND

*Standard direct drive indoor (evaporator) fan motor (IFM). For optionalbelt drive IFM performance, see table on page 8.

NOTES:1. Above fan performance is based on wet coil and deducted casing

losses, and clean factory-installed permanent cleanable filter.

2. Evaporator fans are direct drive (except 048, 060 special orderevaporator-fan motor option). Refer to Belt Drive Evaporator FanPerformance table on page 8.

3. Interpolation is permissible, do not extrapolate.4. For units installed with accessory electric heaters, see Electric

Heater Static Pressure Drop table for additional performance losses.

50AH048

TempAir Ent

Condenser(F)

Evaporator Air Quantity Cfm/BF1200/0.06 1600/0.08 2000/0.10

Evaporator Air Ewb Temp (F)72 67 62 57 72 67 62 57 72 67 62 57

85TC 56.0 52.1 47.9 44.4 57.7 54.5 50.6 49.6 59.4 56.0 52.7 52.3SHC 27.8 34.8 41.6 44.4 30.2 39.6 48.0 49.6 32.8 43.9 52.5 52.3kW 3.77 3.68 3.59 3.53 3.81 3.74 3.66 3.64 3.85 3.77 3.70 3.69

95TC 54.0 50.1 45.7 42.4 55.7 52.3 48.6 47.3 57.4 53.8 51.0 50.9SHC 27.1 34.0 40.4 42.4 29.6 38.8 47.0 47.3 32.4 43.2 50.9 50.9kW 4.21 4.11 4.01 3.95 4.25 4.18 4.09 4.07 4.31 4.21 4.15 4.15

105TC 51.8 47.9 42.3 40.2 53.6 50.0 45.1 45.0 54.6 51.4 48.9 48.6SHC 26.3 33.1 38.8 40.2 29.0 38.0 44.8 45.0 31.3 42.4 48.9 48.6kW 4.69 4.58 4.45 4.40 4.75 4.65 4.54 4.53 4.77 4.69 4.63 4.63

115TC 49.5 45.5 38.6 37.7 51.2 47.6 41.9 42.1 52.2 49.1 45.8 45.8SHC 25.5 32.2 37.0 37.7 28.3 27.3 41.8 42.1 30.7 42.0 45.8 45.8kW 5.21 5.09 4.92 4.89 5.27 5.17 5.03 5.03 5.30 5.23 5.14 5.14

BF — Bypass FactorEwb — Entering Wet-BulbkW — Compressor Motor Power Input (kilowatts)SHC — Gross Sensible Heat Capacity (1000 Btuh)TC — Gross Total Cooling Capacity (1000 Btuh)

BYPASSFACTOR

(BF)

ENTERING AIR DRY-BULB TEMPERATURE (F)79 78 77 76 75 Under 7581 82 83 84 85 Over 85

Correction Factor.025 1.07 2.12 3.19 4.25 5.32

Use formulashown below

.05 1.04 2.07 3.11 4.14 5.18

.10 .98 1.96 2.94 3.92 4.90

.20 .87 1.74 2.62 3.49 4.36

.30 .76 1.53 2.29 3.05 3.82

.35 .71 1.42 2.13 2.83 3.54

50AH060

TempAir Ent

Condenser(F)

Evaporator Air Quantity — Cfm/BF1500/0.06 2000/0.09 2250/0.10

Evaporator Air Ewb Temp (F)72 67 62 72 67 62 72 67 62

85TC 64.8 58.5 52.9 68.0 61.5 56.3 68.9 62.5 58.0SHC 33.2 41.1 48.5 37.2 47.3 55.7 38.9 50.0 57.7kW 4.49 4.29 4.13 4.59 4.83 4.22 4.62 4.41 4.27

95TC 61.9 55.7 50.2 65.1 58.7 54.0 66.1 59.7 55.8SHC 32.3 40.1 47.3 36.4 46.5 54.0 38.2 49.3 55.8kW 4.94 4.72 4.57 5.04 4.81 4.67 5.07 4.84 4.72

105TC 58.5 52.4 47.2 61.5 55.2 51.4 62.6 56.3 53.3SHC 31.1 38.8 45.8 35.2 45.2 51.4 37.1 48.1 58.2kW 5.41 5.20 5.04 5.51 5.28 5.16 5.55 5.32 5.22

115TC 54.9 49.0 44.1 57.8 51.7 48.7 58.7 52.6 50.4SHC 29.8 37.5 44.0 34.0 43.9 48.7 35.9 46.7 50.4kW 5.93 5.72 5.56 6.04 5.80 5.70 6.07 5.83 5.75

tldb = tedb –sensible capacity (Btuh)

1.10 x cfm

tlwb = Wet-bulb temperature corresponding to enthalpy of air leavingevaporator col (hlwb).

hlwb = hewb –total capacity (Btuh)

4.5 x cfm

CFMUNIT SIZE — 50AH

024 036 048* 060*ESP Fan kW ESP Fan kW ESP Fan kW ESP Fan kW

600 .60 .20 — — — — — —700 .54 .22 — — — — — —800 .43 .24 — — — — — —900 .29 .26 .69 .44 — — — —

1000 .11 .29 .57 .46 — — — —1100 — — .42 .49 1.10 .45 1.11 .521200 — — .23 .52 1.01 .49 1.045 .551300 — — — — .90 .51 .97 .571400 — — — — .79 .55 .88 .591500 — — — — .67 .58 .78 .621600 — — — — .54 .61 .67 .641700 — — — — .39 .64 .53 .671800 — — — — .22 .67 .52 .701900 — — — — .03 .70 .40 .742000 — — — — — — .28 .78

ESP — External Static Pressure (in. wg)kW — Total Fan Motor Power Input (kilowatts)

Performance data (cont)

8

BELT DRIVE EVAPORATOR FAN PERFORMANCE(Special Order Only, Pricing andordering on related price pages.)

LEGEND

NOTE: Pulley setting must be adjusted to limit cfm to 450 cfm/tonmaximum. Unit operation beyond that limit may result in blow-off andcondensate problems.

CONDENSER FAN PERFORMANCE

LEGENDkW — Total Fan Motor Power Input (kilowatts)NOTES:1. Above fan performance is based upon coil and deducted casing

losses only.2. External static pressure (ESP) is measured in inches water gage

(in. wg).3. Interpolation is permissible. Do not extrapolate.4. Condenser fan on unit size 024 only, is direct drive.

5. Minimum one turn open of motor pulley is required on unit sizes 036and 060.

6. Number of turns open applies to field setting of motor pulley.7. Factory setting as follows: 036, 4 turns open; 048, 2 turns open; 060,

5 turns open.

CFMUNIT SIZE — 50AH

048 060ESP Fan kW ESP Fan kW

1800 — — — —1850 — — — —1900 — — — —1950 .81 1.03 — —2000 .72 1.05 — —2050 .63 1.07 — —2100 .55 1.08 1.02 1.172150 .47 1.11 .93 1.212200 .42 1.14 .84 1.242250 .34 1.17 .75 1.27

ESP — External Static Pressure (in. wg)kW — Total Fan Power Motor Input (kilowatts)

UNIT50AH

CONDCFM

EXTERNAL STATIC PRESSURE (in. wg)0.0 0.1 0.2 0.3 0.4 0.5 0.6

Turns kW Turns kW Turns kW Turns kW Turns kW Turns kW Turns kW

024

1525 Note 4 .66 — — — — — — — — — — — —1475 — — Note 4 .64 — — — — — — — — — —1400 — — — — Note 4 .63 — — — — — — — —1350 — — — — — — Note 4 .62 — — — — — —1300 — — — — — — — — Note 4 .62 — — — —

036

1650 2 .84 — — — — — — — — — — — —1600 — — 2 .82 — — — — — — — — — —1550 — — — — 2 .80 — — — — — — — —1500 3 .72 — — — — 2 .78 1 .84 — — — —1450 4 .63 3 .70 — — — — 2 .76 1 .83 — —1400 — — 4 .61 3 .68 — — — — — — 1 .811350 5 .51 — — — — 3 .67 — — 2 .73 — —1300 — — 5 .50 4 .57 — — 3 .65 — — 2 .71

048

2700 2 .90 — — — — — — — — — — — —2600 — — 2 .87 — — — — — — — — — —2550 3 .81 — — — — — — — — — — — —2450 — — 3 .77 2 .83 1 .89 — — — — — —2350 — — — — — — 2 .80 1 .86 — — — —2300 4 .68 — — 3 .74 — — — — 0 .90 — —2200 — — 4 .66 — — — — 2 .77 1 .82 0 .86

060

3100 3 1.34 — — — — — — — — — — — —3000 — — 3 1.32 — — — — — — — — — —2900 — — — — — — 2 1.39 — — — — — —2850 4 1.11 — — 3 1.24 — — — — — — — —2750 — — 4 1.07 — — — — 2 1.32 — — — —2700 — — — — — — 3 1.17 — — — — — —2650 — — — — — — — — — — — — 1 1.372600 5 .95 — — 4 1.01 — — — — 2 1.26 — —2550 — — — — — — — — 3 1.12 — — — —2500 — — 5 .92 — — — — — — — — — —2450 — — — — — — 4 .97 — — — — 2 1.212400 — — — — 5 .90 — — — — 3 1.08 — —

Performance data (cont)

9

Operating sequenceCooling

1. Thermostat calls for cooling.a. Indoor (evaporator) fan relay is energized and starts

evaporator fan.b. Compressor contactor is energized to start com-

pressor and condenser fan (up to a 5-minute delayon single-phase units).

2. When room thermostat is satisfied, the evaporatorfan, compressor, and condenser fan shut off.

Continuous fan operation — The thermostat can beset for continuous operation by setting the fan switch toON.

Electrical data

LEGEND

*Optional evaporator-fan motor nameplate data.

UNIT50AH

V-PH(60 Hz)

VOLTAGE RANGE COMPRESSORFAN MOTORS POWER SUPPLY

Evaporator Condenser Min CktAmps

MOCPAmpsMin Max RLA LRA Hp FLA Hp FLA

024 230-1 207 254 11.5 62.5 .17 1.10 .50 3.40 19.1 25

036230-1 207 254 17.2 96.0 .50 3.20 .75 6.06 29.5 40

208/230-3 187 254 10.2 77.0 .50 3.20 .75 3.93 19.9 25460-3 414 508 4.3 37.0 .50 1.50 .75 1.97 8.8 15

048

230-1 207 254 23.7 129.0 .75 4.00 1.0 8.35 42.0 60208/230-3 187 254 13.5 99.0 .75 4.00 1.0 3.93 24.8 35

460-3 414 508 7.4 49.5 .75 2.15 1.0 1.97 13.4 15575-3 518 632 5.8 40.0 .75 1.40 1.0 1.45 10.1 15

048* 208/230-3 187 254 13.5 99.0 1.5 5.60 1.0 3.93 26.4 35460-3 414 508 7.4 49.5 1.5 2.80 1.0 1.97 14.0 20

060

230-1 207 254 28.8 169.0 .75 4.00 1.5 9.50 49.5 70208/230-3 187 254 17.3 123.0 .75 4.00 1.5 4.82 30.4 45

460-3 414 508 9.0 62.0 .75 2.15 1.5 2.41 15.8 25575-3 518 632 7.1 50.0 .75 1.40 1.5 1.90 12.2 20

060* 208/230-3 187 254 17.3 123.0 1.5 5.60 1.5 4.82 32.0 40460-3 414 508 9.0 62.0 1.5 2.80 1.5 2.41 16.5 25

HACR — Heating, Air Conditioning, and RefrigerationHp — HorsepowerFLA — Full Load AmpsLRA — Locked Rotor AmpsMOCP — Maximum Overcurrent Protection (HACR breaker)RLA — Rated Load Amps

Controls

10

ELECTRIC HEATER DATA

LEGEND

*May be field converted to single-phase units, see electric heat installation instructions.NOTE: Separate power source is required for all heaters. Control from base unit 50AH (24 v).

ELECTRIC HEATER STATIC PRESSURE DROP (in. wg)

NOTE: Above electric heaters are not UL or CSA listed for use with optional high-static evaporator-fan motor (048, 060 units only)

ELECTRIC HEATERUNIT 88EN

USED WITHUNIT 50AH

V-PH(60 Hz) CAP. (kW)

BRANCH CIRCUITHeater Amps MCA MOCP (Amps)

0050CA01

024, 0361-Stage Heat

240-1 5.0 20.8 26.0 300075CA01 240-1 7.5 31.3 39.1 400115CA01 240-1 11.5 47.9 59.9 60

0075EA01 208-3 5.6 15.6 19.5 20240-3 7.6 18.0 22.6 25

1150EA01 208-3 11.3 31.2 39.0 40240-3 15.0 36.1 45.1 50

0100EA01

048, 0602-Stage Heat

208-3 7.5 20.8 26.0 30240-1* 10.0 41.7 52.1 60240-3 10.0 24.1 30.1 35

0150EA01208-3 11.3 31.2 39.0 40240-1* 15.0 62.5 78.1 80240-3 15.0 36.1 45.1 50

0200EA01208-3 15.0 41.7 52.1 60240-1* 20.0 83.3 104.2 110240-3 20.0 46.9 58.6 60

0300EA01 208-3 22.5 62.5 78.2 80240-3 30.0 72.2 90.2 100

0300CA01 240-1 30.0 124.0 155.0 1750100FA01 480-3 10.0 12.0 15.0 150150FA01 480-3 15.0 18.1 22.6 250200FA01 480-3 20.0 24.1 30.1 350300FA01 480-3 30.0 36.1 45.1 50

MCA — Minimum Circuit AmpacityMOCP — Maximum Overcurrent Circuit Protection

(Fuses or Circuit Breaker)

ELECTRIC HEATERUNIT 88EN

UNIT50AH

MINCFM

UNIT CFM600 800 1000 1200 1400 1600 1800 2000 2200

0500CA01024, 0361-stage

heat

400 .02 .04 .06 .10 — — — — —0075CA01 510 .03 .06 .10 .16 — — — — —0115CA01 620

.04 .08 .13 .19 — — — — —0075EA01 3201150EA01 7200100EA01

048, 0602-stage

heat

970 — — — .04 .06 .08 .12 .15 .170150EA01 12400200EA01 1350

— — — .08 .11 .14 .18 .22 .260300EA01 12200300CA01 12200100FA01 1130 — — — .04 .06 .08 .12 .15 .170150FA01 13600200FA01 1350 — — — .08 .11 .14 .18 .22 .260300FA01 1270

Electrical data (cont)

11

Typical wiring schematic

50AH036,048,060; 208/230-3-60 AND 50AH036; 208/230-1-60

NOTES:1. Compressor and fan motors are thermally protected 3-phase motors

protected against primary single-phase condition.2. If any original wires furnished must be replaced, it should be replaced

with 90 C or its equivalent.3. Numbers indicate the line location of used contacts. A bracket over 2

numbers signifies a single-pole double-throw contact. An underlinednumber signifies a normally closed contact.

4. Must use thermostat HH07AT170, 172 or 174 with subbaseHN63AZ176, 177 or 178.

5. Separate field power supply required for electric heater accessory.

LEGEND

AHA — Adjustable Heat AnticipatorC — Contactor CompressorCB — Circuit BreakerCC — Cooling CompensatorCLO — Compressor LockoutCT — Current TransformerEQUIP GND — Equipment GroundHPS — High-Pressure SwitchHR — Heater RelayIFC — Indoor (Evaporator) Fan ContactorIFR — Indoor (Evaporator) Fan RelayJB — Junction BoxL — LightLOR — Lockout RelayLPS — Low-Pressure SwitchNEC — National Electrical CodePL — Plug AssemblyTB — Terminal BlockTC — Thermostat-CoolingTH — Thermostat-HeatingTRAN — Transformer

Marked Wire

Denotes connection point between subbase and thermostat

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Field Splice

Splice (Marked)

Factory Splice

Factory Wiring

Accessory or Optional Wiring

Field Control Wiring

Field Power Wiring

To indicate common potential only not to represent wiring

12

Typical wiring schematic (cont)

50AH024,028,060; 208/230-1-60

NOTES:1. Neutral for 240/416 v supply (Canada only).2. If any original wires furnished must be replaced, it should be replaced

with 90 C or its equivalent.3. Numbers indicate the line location of used contacts. A bracket over 2

numbers signifies a single-pole double-throw contact. An underlinednumber signifies a normally closed contact.

4. Must use thermostat HH07AT170, 172 or 174 with subbaseHN63AZ176, 177 or 178.

5. Separate field power supply required for electric heater accessory.

LEGEND

AHA — Adjustable Heat AnticipatorC — Contactor CompressorCB — Circuit BreakerCC — Cooling CompensatorCLO — Compressor LockoutCOMP — Compressor MotorEQUIP GND — Equipment GroundHPS — High-Pressure SwitchHR — Heater RelayIFC — Indoor (Evaporator) Fan ContactorIFR — Indoor (Evaporator) Fan RelayJB — Junction BoxL — LightLPS — Low-Pressure SwitchNEC — National Electrical CodePL — Plug AssemblyTB — Terminal BlockTC — Thermostat-CoolingTH — Thermostat-HeatingTRAN — Transformer

Marked Wire

Denotes connection point between subbase and thermostat

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Field Splice

Splice (Marked)

Factory Splice

Factory Wiring

Accessory or Optional Wiring

Field Control Wiring

Field Power Wiring

To indicate common potential only not to represent wiring

13

Application dataOUTDOOR-AIR TEMPERATURE OPERATING LIMITS (F)

Field splitting instructions — If components are split,maximum length of refrigerant tubing to be used is 50 ft,assuming components are installed in same horizontalplane. Condenser may be mounted up to 12-ft aboveevaporator. Liquid line tubing is 3/8-in. OD copper tubing,and discharge line is 1/2-in. OD copper tubing. For addi-tional piping information, refer to Carrier System DesignManual, Part 3. Units should always be within line of sightfrom each other, or separate NEC (National Electrical

Code) disconnects will be required. Junction boxes shouldbe installed in both the evaporator and condenser sectionsadjacent to D-shaped grommets, to provide a location tosplice the outdoor-fan motor factory wiring (no. 16 AWG[American Wire Gage], 4/64-in. thick insulation). Field wir-ing should be a minimum of no. 16 AWG, 4/64-in. thickinsulation. Check all applicable electrical codes to ensureproper compliance.

UNIT 50AH 024 036 048 060Without Head Pressure Control Minimum 35 35 40 40

Maximum 126 126 126 126With Head Pressure Control Minimum 0 0 0 0

Maximum 126 126 126 126

Typical piping and wiring

LEGENDNEC — National Electrical CodeNOTES:1. Wiring and piping shown are not intended for or to include all

details for specific installation.2. All wiring must comply with applicable local and national codes.

3. All piping must follow standard refrigerant piping techniques. Referto Carrier System Design Manual, Part 3, for details.

4. For other installation details refer to Installation Instructions.5. If unit sections are field split, 8 threaded support rods are required.6. Ensure condenser air recirculation is minimized.

14

Indoor Packaged UnitHVAC Guide Specifications — Section 15787Size Range: 2 to 5 Tons, NominalCarrier Model Number: 50AHPart 1 — General1.01 SYSTEM DESCRIPTION

Indoor mounted, electrically controlled packagedhorizontal cooling unit utilizing a hermetic typescroll compressor.

1.02 QUALITY ASSURANCEA. Unit shall be certified in accordance with ARI

Standard 210.B. Unit shall be UL listed and carry a UL label.C. Unit shall be CSA approved (except 3 ton, 3-phase

units).D. Unit shall be factory run-tested to ensure proper

performance prior to delivery.1.03 DELIVERY, STORAGE, AND HANDLING

A. Unit shall be shipped completely assembled andready to operate.

B. Unit shall be shipped factory charged with refriger-ant R-22.

C. Unit shall be stored and handled in accordance withthe unit manufacturer’s instructions.

Part 2 — Products2.01 EQUIPMENT

A. General:Factory assembled horizontal, single piece, aircooled, indoor, ceiling plenum mounted electriccooling unit. Contained within the unit enclosureshall be all factory wiring, piping, controls, refriger-ant charge (R-22), and special features requiredprior to start-up.

B. Unit Cabinet:1. Constructed of galvanized steel.2. Interior shall be insulated with 1/2-in. thick neo-

prene coated fiberglass. Insulation shall bebonded to interior surfaces by sprayed waterreduceable adhesive.

3. Equipped with 3 same side access panels and2 bottom hanging removable doors to facilitateease of maintenance. Side panels allow accessto the control box, refrigeration components,and condenser coil. Control box shall be hingedallowing access to the compressor and pressureswitches. Bottom doors shall allow access toand easy removal of the condenser and evapo-rator motors and blower assemblies.

4. Equipped with two 3/4-in. threaded condensatedrain connections below the evaporator coiland one 3/4-in. threaded connection for con-denser coil wash down. Connections shall befactory plugged for field removal.

5. Field splittable through the removal of 4 boltsand extending refrigerant piping and wiring toallow remote horizontal or vertical condensermounting.

6. Unit shall have an integral hanging bracketrequiring only 4 threaded rods (8 if unit is split)run to the top flange of the unit for hanging,eliminating need for external hanger brackets.

7. Contains junction box for power connectionand opening for routing of control wiring.

C. Fans:1. Evaporator:

a. Blower shall be of the forward-curved, cen-trifugal, direct-drive type or belt drive (4 and5 tons only).

b. Motor shall have permanently lubricatedbearings.

c. Unit sizes 048, 060 shall be available withan optional 1.5 hp fan motor.

2. Condenser:a. Blower shall be of the forward-curved, cen-

trifugal, direct-driven type (024 only), or beltdrive (036,048,060).

b. Motor shall have permanently lubricatedbearings.

D. Compressor:1. Fully hermetic scroll type.2. Mounted on suitable spring vibration isolators.3. Equipped with internal line break protection.

E. Coils:Evaporator and condenser coils shall be of non-ferrous construction with aluminum fins mechani-cally bonded to seamless copper tubes with all jointsbrazed.

F. Refrigerant Components:Refrigerant components shall include:

1. Capillary tube feed system.2. Refrigerant filter-drier.

G. Filter Section:Filter section shall consist of factory-installed, per-manent, cleanable air filter, removable from thesame side as the access panels without the use oftools.

H. Controls and Safeties:Control system shall include a high-pressure switch,a low-pressure switch, and a compressor lockoutfeature which upon tripping of any safety deviceshall prevent compressor from restarting until resetat the thermostat (on all 3-phase units and 036single-phase units only).Time Guard® II device (024,048,060 single-phaseonly) shall prevent the compressor from restartingfor a minimum of 5 minutes after shutdown.

Guide specifications

15

I. Operating characteristics:1. Unit shall operate using refrigerant R-22.2. Unit shall be designed for indoor suspended

horizontal mounting and operation.J. Electrical Requirements

Unit shall have single point power connection toleads in terminal box.

K. Special Features:Certain standard features are not applicable whenthe features designated by * are specified. For assis-tance in amending the specifications, your localCarrier Sales Office should be contacted.

* 1. Electric Heat Module:a. Provides encased heater elements that shall

attach directly to the base unit discharge.b. Shall have bottom access.c. UL listed.

2. Thermostat Assembly:Provides cooling and fan control. Standard sub-base shall include ‘‘Compressor malfunctionlight’’ designed to illuminate if compressor lock-out is activated.

3. Compressor Cycle Delay:Prevents compressor from restarting for a mini-mum of 5 minutes after shutdown.

* 4. Condensate Pump:Unit shall be equipped with remotely locatedcondensate pump. A field installed light shallilluminate when reservoir rises above a presetlevel. Unit shall shut down upon reservoir lightillumination.

* 5. Head Pressure Control Package:Allows unit to mechanically cool down to 0° Fambient temperature. Package shall includedamper operating device and all necessaryhardware.

6. Vibration Isolation Package:Shall provide 4 spring hangers for ceilingmounted unit to damper vibration that may betransmitted to building structure.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.New Pg 16 Catalog No. 525-00001 Printed in U.S.A. PC111 Form 50AH-5PD

Replaces: 50AH-4PDBook 1 1Tab 2b 7a

Carrier Corporation • Syracuse, New York 13221 9-00

Book 1Tab IP1a